[–] 13662089? 0 points 6 points 6 points (+6|-0) ago (edited ago)
I have. Apparently you haven't.
https://www.csmonitor.com/USA/2011/0809/Flash-mob-attacks-Rising-concern-over-black-teen-involvement
This one is literally from today.
http://www.chicagotribune.com/news/local/breaking/ct-met-chicago-downtown-teens-20180529-story.html
https://www.nbcchicago.com/news/local/mag-mile-mob-attacks-482435881.html